反刍动物营养 Ruminant Nutrition

烟酸对水牛瘤胃发酵指标及微生物区系的影响

  • 林波 ,
  • 梁辛 ,
  • 韦升菊 ,
  • 李丽莉 ,
  • 梁贤威 ,
  • 李萍 ,
  • 邹彩霞
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  • 中国农业科学院广西水牛研究所, 农业部(广西)水牛遗传繁育重点实验室, 南宁 530001

收稿日期: 2015-03-02

  网络出版日期: 2015-08-13

基金资助

国家自然科学基金项目(31160470);广西自然科学基金项目(2013GXNSFBA019114)

Effects of Niacin on Ruminal Fermentation Indexes and Microflora of Water Buffaloes

  • LIN Bo ,
  • LIANG Xin ,
  • WEI Shengju ,
  • LI Lili ,
  • LIANG Xianwei ,
  • LI Ping ,
  • ZOU Caixia
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  • Key Laboratory of Buffalo Genetics, Breeding and Reproduction, Ministry of Agriculture and Guangxi, Buffalo Research Institute, Chinese Academy of Agricultural Sciences, Nanning 530001, China

Received date: 2015-03-02

  Online published: 2015-08-13

摘要

本试验旨在研究饲粮添加烟酸对水牛瘤胃发酵指标及微生物区系的影响。试验选用 36头健康状况良好,体重接近的杂交泌乳水牛,随机分为4个组,分别在基础饲粮中添加0(对照)、4、8、12 g/d烟酸,烟酸与精料混合饲喂,进行预试期14 d,正试期42 d的饲养试验。试验结束后,胃管采集瘤胃液测定瘤胃发酵指标,并采用Illumina Miseq PE250高通量测序平台分别测序瘤胃细菌和甲烷菌16S rRNA基因以确定二者区系组成。结果表明:1)与对照组相比,添加12 g/d烟酸提高了水牛日均采食量(P<0.05)和瘤胃液氨态氮浓度(P>0.05),烟酸各组均显著降低了瘤胃液总挥发性脂肪(TVFA)浓度(P<0.05),但未显著影响瘤胃液pH(P>0.05)。2)水牛瘤胃内细菌在门水平上主要以拟杆菌门和厚壁菌门为主,科水平上为普雷沃氏菌科和黄杆菌科;甲烷菌以甲烷短杆菌属为主,占90%以上,其次为甲烷球菌属和热原体属,水牛瘤胃微生物区系总体上与奶牛等其他利用植物纤维的反刍动物相似。3)与对照组相比,饲粮添加烟酸显著降低了瘤胃内厚壁菌门的比例(P<0.05),显著提高了黄杆菌科细菌的比例(P<0.05),但对瘤胃甲烷菌区系无显著影响(P>0.05)。饲粮添加烟酸改变了水牛瘤胃发酵指标和微生物区系组成,瘤胃发酵指标的变化除了与烟酸对水牛热应激的缓解和消化吸收的影响有关,还与烟酸添加对瘤胃细菌区系的影响有关。

本文引用格式

林波 , 梁辛 , 韦升菊 , 李丽莉 , 梁贤威 , 李萍 , 邹彩霞 . 烟酸对水牛瘤胃发酵指标及微生物区系的影响[J]. 动物营养学报, 2015 , 27(8) : 2396 -2404 . DOI: 10.3969/j.issn.1006-267x.2015.08.011

Abstract

This study was conducted to study the effects of dietary addition of niacin on ruminal fermentation indexes and microflora of water buffaloes. Thirty-six healthy hybrid water buffaloes with similar body weight were selected and divided into four groups randomly. The four groups were fed the same basal diet but added with 0 (control), 4, 8 and 12 g/d, respectively. Niacin was mixed in concentrate to feed. The advanced experiment feeding period was 14 days and the formal experimental period was 42 days. At the end of experiment, rumen fluid samples were taken from rumen by stomach tube to test the ruminal fermentation indexes, 16S rRNA genes of ruminal bacteria and methanogen were tested to determine microbial community by Illumina Miseq PE250 high-throughput sequencing. The results showed as follows: 1) compared with control group, the addition of 12 g/d of niacin increased average daily feed intake (P<0.05) and rumen fluid ammonia concentration (P>0.05), niacin groups significantly decreased rumen fluid total volatile fatty acid (TVFA) concentration (P<0.05), but the rumen fluid pH was not significantly influenced (P>0.05). 2) Water buffalo ruminal bacterial community was dominated by Bacteroidetes and Firmicutes at phyla level, Prevotellaceae and Fibrobacteraceae at family level, while ruminal methanogen community was dominated by Methanobrevibacter (over 90%) at genus level, followed by Methanosphaera and Thermoplasma. Water buffalo ruminal bacteria and methanogen community composition was generally similar with other ruminants which could utilize plant fiber. 3) Compared with control group, the addition of niacin significantly decreased ruminal Firmicutes the proportion (P<0.05), and significantly increased ruminal Fibrobacteraceae proportion (P<0.05), but there was no influence on methanogen community (P>0.05). In conclusion, the addition of niacin changes ruminal fermentation indexes and microflora of water buffaloes, the changes of ruminal fermentation indexes on one hand are related with release on heat stress and improvement on digestion of niacin, on another hand are related with the change of ruminal microflora.

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